mirror of https://github.com/PurpleI2P/i2pd.git
I2P: End-to-End encrypted and anonymous Internet
https://i2pd.website/
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
415 lines
13 KiB
415 lines
13 KiB
#include <string.h> |
|
#include <fstream> |
|
#include <sstream> |
|
#include <boost/regex.hpp> |
|
#include <boost/filesystem.hpp> |
|
#include <boost/asio.hpp> |
|
#include <boost/asio/ssl.hpp> |
|
#include <openssl/bn.h> |
|
#include <openssl/ssl.h> |
|
#include <openssl/err.h> |
|
#include <zlib.h> |
|
#include "I2PEndian.h" |
|
#include "Reseed.h" |
|
#include "Log.h" |
|
#include "Identity.h" |
|
#include "Crypto.h" |
|
#include "NetDb.h" |
|
#include "util.h" |
|
|
|
|
|
namespace i2p |
|
{ |
|
namespace data |
|
{ |
|
static std::vector<std::string> httpsReseedHostList = |
|
{ |
|
"https://reseed.i2p-projekt.de/", // Only HTTPS |
|
"https://i2pseed.zarrenspry.info/", // Only HTTPS and SU3 (v3) support |
|
"https://i2p.mooo.com/netDb/", |
|
"https://netdb.i2p2.no/", // Only SU3 (v3) support, SNI required |
|
"https://us.reseed.i2p2.no:444/", |
|
"https://uk.reseed.i2p2.no:444/", |
|
"https://www.torontocrypto.org:8443/" |
|
"https://reseed.i2p.vzaws.com:8443/", // Only SU3 (v3) support |
|
"https://user.mx24.eu/", // Only HTTPS and SU3 (v3) support |
|
"https://ieb9oopo.mooo.com/" // Only HTTPS and SU3 (v3) support |
|
}; |
|
|
|
Reseeder::Reseeder() |
|
{ |
|
} |
|
|
|
Reseeder::~Reseeder() |
|
{ |
|
} |
|
|
|
int Reseeder::ReseedNowSU3 () |
|
{ |
|
auto ind = rand () % httpsReseedHostList.size (); |
|
std::string& reseedHost = httpsReseedHostList[ind]; |
|
return ReseedFromSU3 (reseedHost); |
|
} |
|
|
|
int Reseeder::ReseedFromSU3 (const std::string& host) |
|
{ |
|
std::string url = host + "i2pseeds.su3"; |
|
LogPrint (eLogInfo, "Dowloading SU3 from ", host); |
|
std::string su3 = HttpsRequest (url); |
|
if (su3.length () > 0) |
|
{ |
|
std::stringstream s(su3); |
|
return ProcessSU3Stream (s); |
|
} |
|
else |
|
{ |
|
LogPrint (eLogWarning, "SU3 download failed"); |
|
return 0; |
|
} |
|
} |
|
|
|
int Reseeder::ProcessSU3File (const char * filename) |
|
{ |
|
std::ifstream s(filename, std::ifstream::binary); |
|
if (s.is_open ()) |
|
return ProcessSU3Stream (s); |
|
else |
|
{ |
|
LogPrint (eLogError, "Can't open file ", filename); |
|
return 0; |
|
} |
|
} |
|
|
|
const char SU3_MAGIC_NUMBER[]="I2Psu3"; |
|
const uint32_t ZIP_HEADER_SIGNATURE = 0x04034B50; |
|
const uint32_t ZIP_CENTRAL_DIRECTORY_HEADER_SIGNATURE = 0x02014B50; |
|
const uint16_t ZIP_BIT_FLAG_DATA_DESCRIPTOR = 0x0008; |
|
int Reseeder::ProcessSU3Stream (std::istream& s) |
|
{ |
|
char magicNumber[7]; |
|
s.read (magicNumber, 7); // magic number and zero byte 6 |
|
if (strcmp (magicNumber, SU3_MAGIC_NUMBER)) |
|
{ |
|
LogPrint (eLogError, "Unexpected SU3 magic number"); |
|
return 0; |
|
} |
|
s.seekg (1, std::ios::cur); // su3 file format version |
|
SigningKeyType signatureType; |
|
s.read ((char *)&signatureType, 2); // signature type |
|
signatureType = be16toh (signatureType); |
|
uint16_t signatureLength; |
|
s.read ((char *)&signatureLength, 2); // signature length |
|
signatureLength = be16toh (signatureLength); |
|
s.seekg (1, std::ios::cur); // unused |
|
uint8_t versionLength; |
|
s.read ((char *)&versionLength, 1); // version length |
|
s.seekg (1, std::ios::cur); // unused |
|
uint8_t signerIDLength; |
|
s.read ((char *)&signerIDLength, 1); // signer ID length |
|
uint64_t contentLength; |
|
s.read ((char *)&contentLength, 8); // content length |
|
contentLength = be64toh (contentLength); |
|
s.seekg (1, std::ios::cur); // unused |
|
uint8_t fileType; |
|
s.read ((char *)&fileType, 1); // file type |
|
if (fileType != 0x00) // zip file |
|
{ |
|
LogPrint (eLogError, "Can't handle file type ", (int)fileType); |
|
return 0; |
|
} |
|
s.seekg (1, std::ios::cur); // unused |
|
uint8_t contentType; |
|
s.read ((char *)&contentType, 1); // content type |
|
if (contentType != 0x03) // reseed data |
|
{ |
|
LogPrint (eLogError, "Unexpected content type ", (int)contentType); |
|
return 0; |
|
} |
|
s.seekg (12, std::ios::cur); // unused |
|
|
|
s.seekg (versionLength, std::ios::cur); // skip version |
|
char signerID[256]; |
|
s.read (signerID, signerIDLength); // signerID |
|
signerID[signerIDLength] = 0; |
|
|
|
//try to verify signature |
|
auto it = m_SigningKeys.find (signerID); |
|
if (it != m_SigningKeys.end ()) |
|
{ |
|
// TODO: implement all signature types |
|
if (signatureType == SIGNING_KEY_TYPE_RSA_SHA512_4096) |
|
{ |
|
size_t pos = s.tellg (); |
|
size_t tbsLen = pos + contentLength; |
|
uint8_t * tbs = new uint8_t[tbsLen]; |
|
s.seekg (0, std::ios::beg); |
|
s.read ((char *)tbs, tbsLen); |
|
uint8_t * signature = new uint8_t[signatureLength]; |
|
s.read ((char *)signature, signatureLength); |
|
// RSA-raw |
|
{ |
|
// calculate digest |
|
uint8_t digest[64]; |
|
SHA512 (tbs, tbsLen, digest); |
|
// encrypt signature |
|
BN_CTX * bnctx = BN_CTX_new (); |
|
BIGNUM * s = BN_new (), * n = BN_new (); |
|
BN_bin2bn (signature, signatureLength, s); |
|
BN_bin2bn (it->second, i2p::crypto::RSASHA5124096_KEY_LENGTH, n); |
|
BN_mod_exp (s, s, i2p::crypto::GetRSAE (), n, bnctx); // s = s^e mod n |
|
uint8_t * enSigBuf = new uint8_t[signatureLength]; |
|
i2p::crypto::bn2buf (s, enSigBuf, signatureLength); |
|
// digest is right aligned |
|
// we can't use RSA_verify due wrong padding in SU3 |
|
if (memcmp (enSigBuf + (signatureLength - 64), digest, 64)) |
|
LogPrint (eLogWarning, "SU3 signature verification failed"); |
|
delete[] enSigBuf; |
|
BN_free (s); BN_free (n); |
|
BN_CTX_free (bnctx); |
|
} |
|
|
|
delete[] signature; |
|
delete[] tbs; |
|
s.seekg (pos, std::ios::beg); |
|
} |
|
else |
|
LogPrint (eLogWarning, "Signature type ", signatureType, " is not supported"); |
|
} |
|
else |
|
LogPrint (eLogWarning, "Certificate for ", signerID, " not loaded"); |
|
|
|
// handle content |
|
int numFiles = 0; |
|
size_t contentPos = s.tellg (); |
|
while (!s.eof ()) |
|
{ |
|
uint32_t signature; |
|
s.read ((char *)&signature, 4); |
|
signature = le32toh (signature); |
|
if (signature == ZIP_HEADER_SIGNATURE) |
|
{ |
|
// next local file |
|
s.seekg (2, std::ios::cur); // version |
|
uint16_t bitFlag; |
|
s.read ((char *)&bitFlag, 2); |
|
bitFlag = le16toh (bitFlag); |
|
uint16_t compressionMethod; |
|
s.read ((char *)&compressionMethod, 2); |
|
compressionMethod = le16toh (compressionMethod); |
|
s.seekg (4, std::ios::cur); // skip fields we don't care about |
|
uint32_t compressedSize, uncompressedSize; |
|
uint32_t crc_32; |
|
s.read ((char *)&crc_32, 4); |
|
crc_32 = le32toh (crc_32); |
|
s.read ((char *)&compressedSize, 4); |
|
compressedSize = le32toh (compressedSize); |
|
s.read ((char *)&uncompressedSize, 4); |
|
uncompressedSize = le32toh (uncompressedSize); |
|
uint16_t fileNameLength, extraFieldLength; |
|
s.read ((char *)&fileNameLength, 2); |
|
fileNameLength = le16toh (fileNameLength); |
|
s.read ((char *)&extraFieldLength, 2); |
|
extraFieldLength = le16toh (extraFieldLength); |
|
char localFileName[255]; |
|
s.read (localFileName, fileNameLength); |
|
localFileName[fileNameLength] = 0; |
|
s.seekg (extraFieldLength, std::ios::cur); |
|
// take care about data desriptor if presented |
|
if (bitFlag & ZIP_BIT_FLAG_DATA_DESCRIPTOR) |
|
{ |
|
size_t pos = s.tellg (); |
|
if (!FindZipDataDescriptor (s)) |
|
{ |
|
LogPrint (eLogError, "SU3 archive data descriptor not found"); |
|
return numFiles; |
|
} |
|
s.read ((char *)&crc_32, 4); |
|
crc_32 = le32toh (crc_32); |
|
s.read ((char *)&compressedSize, 4); |
|
compressedSize = le32toh (compressedSize) + 4; // ??? we must consider signature as part of compressed data |
|
s.read ((char *)&uncompressedSize, 4); |
|
uncompressedSize = le32toh (uncompressedSize); |
|
|
|
// now we know compressed and uncompressed size |
|
s.seekg (pos, std::ios::beg); // back to compressed data |
|
} |
|
|
|
LogPrint (eLogDebug, "Proccessing file ", localFileName, " ", compressedSize, " bytes"); |
|
if (!compressedSize) |
|
{ |
|
LogPrint (eLogWarning, "Unexpected size 0. Skipped"); |
|
continue; |
|
} |
|
|
|
uint8_t * compressed = new uint8_t[compressedSize]; |
|
s.read ((char *)compressed, compressedSize); |
|
if (compressionMethod) // we assume Deflate |
|
{ |
|
z_stream inflator; |
|
memset (&inflator, 0, sizeof (inflator)); |
|
inflateInit2 (&inflator, -MAX_WBITS); // no zlib header |
|
uint8_t * uncompressed = new uint8_t[uncompressedSize]; |
|
inflator.next_in = compressed; |
|
inflator.avail_in = compressedSize; |
|
inflator.next_out = uncompressed; |
|
inflator.avail_out = uncompressedSize; |
|
int err; |
|
if ((err = inflate (&inflator, Z_SYNC_FLUSH)) >= 0) |
|
{ |
|
uncompressedSize -= inflator.avail_out; |
|
if (crc32 (0, uncompressed, uncompressedSize) == crc_32) |
|
{ |
|
i2p::data::netdb.AddRouterInfo (uncompressed, uncompressedSize); |
|
numFiles++; |
|
} |
|
else |
|
LogPrint (eLogError, "CRC32 verification failed"); |
|
} |
|
else |
|
LogPrint (eLogError, "decompression error ", err); |
|
delete[] uncompressed; |
|
inflateEnd (&inflator); |
|
} |
|
else // no compression |
|
{ |
|
i2p::data::netdb.AddRouterInfo (compressed, compressedSize); |
|
numFiles++; |
|
} |
|
delete[] compressed; |
|
if (bitFlag & ZIP_BIT_FLAG_DATA_DESCRIPTOR) |
|
s.seekg (12, std::ios::cur); // skip data descriptor section if presented (12 = 16 - 4) |
|
} |
|
else |
|
{ |
|
if (signature != ZIP_CENTRAL_DIRECTORY_HEADER_SIGNATURE) |
|
LogPrint (eLogWarning, "Missing zip central directory header"); |
|
break; // no more files |
|
} |
|
size_t end = s.tellg (); |
|
if (end - contentPos >= contentLength) |
|
break; // we are beyond contentLength |
|
} |
|
return numFiles; |
|
} |
|
|
|
const uint8_t ZIP_DATA_DESCRIPTOR_SIGNATURE[] = { 0x50, 0x4B, 0x07, 0x08 }; |
|
bool Reseeder::FindZipDataDescriptor (std::istream& s) |
|
{ |
|
size_t nextInd = 0; |
|
while (!s.eof ()) |
|
{ |
|
uint8_t nextByte; |
|
s.read ((char *)&nextByte, 1); |
|
if (nextByte == ZIP_DATA_DESCRIPTOR_SIGNATURE[nextInd]) |
|
{ |
|
nextInd++; |
|
if (nextInd >= sizeof (ZIP_DATA_DESCRIPTOR_SIGNATURE)) |
|
return true; |
|
} |
|
else |
|
nextInd = 0; |
|
} |
|
return false; |
|
} |
|
|
|
void Reseeder::LoadCertificate (const std::string& filename) |
|
{ |
|
SSL_CTX * ctx = SSL_CTX_new (TLSv1_method ()); |
|
int ret = SSL_CTX_use_certificate_file (ctx, filename.c_str (), SSL_FILETYPE_PEM); |
|
if (ret) |
|
{ |
|
SSL * ssl = SSL_new (ctx); |
|
X509 * cert = SSL_get_certificate (ssl); |
|
// verify |
|
if (cert) |
|
{ |
|
// extract issuer name |
|
char name[100]; |
|
X509_NAME_oneline (X509_get_issuer_name(cert), name, 100); |
|
// extract RSA key (we need n only, e = 65537) |
|
RSA * key = X509_get_pubkey (cert)->pkey.rsa; |
|
PublicKey value; |
|
i2p::crypto::bn2buf (key->n, value, 512); |
|
m_SigningKeys[name] = value; |
|
} |
|
SSL_free (ssl); |
|
} |
|
else |
|
LogPrint (eLogError, "Can't open certificate file ", filename); |
|
SSL_CTX_free (ctx); |
|
} |
|
|
|
void Reseeder::LoadCertificates () |
|
{ |
|
boost::filesystem::path reseedDir = i2p::util::filesystem::GetCertificatesDir() / "reseed"; |
|
|
|
if (!boost::filesystem::exists (reseedDir)) |
|
{ |
|
LogPrint (eLogWarning, "Reseed certificates not loaded. ", reseedDir, " doesn't exist"); |
|
return; |
|
} |
|
|
|
int numCertificates = 0; |
|
boost::filesystem::directory_iterator end; // empty |
|
for (boost::filesystem::directory_iterator it (reseedDir); it != end; ++it) |
|
{ |
|
if (boost::filesystem::is_regular_file (it->status()) && it->path ().extension () == ".crt") |
|
{ |
|
LoadCertificate (it->path ().string ()); |
|
numCertificates++; |
|
} |
|
} |
|
LogPrint (eLogInfo, numCertificates, " certificates loaded"); |
|
} |
|
|
|
std::string Reseeder::HttpsRequest (const std::string& address) |
|
{ |
|
i2p::util::http::url u(address); |
|
if (u.port_ == 80) u.port_ = 443; |
|
|
|
boost::asio::io_service service; |
|
boost::system::error_code ecode; |
|
auto it = boost::asio::ip::tcp::resolver(service).resolve ( |
|
boost::asio::ip::tcp::resolver::query (u.host_, std::to_string (u.port_)), ecode); |
|
if (!ecode) |
|
{ |
|
boost::asio::ssl::context ctx(service, boost::asio::ssl::context::sslv23); |
|
ctx.set_verify_mode(boost::asio::ssl::context::verify_none); |
|
boost::asio::ssl::stream<boost::asio::ip::tcp::socket> s(service, ctx); |
|
s.lowest_layer().connect (*it, ecode); |
|
if (!ecode) |
|
{ |
|
s.handshake (boost::asio::ssl::stream_base::client, ecode); |
|
if (!ecode) |
|
{ |
|
LogPrint (eLogInfo, "Connected to ", u.host_, ":", u.port_); |
|
// send request |
|
std::stringstream ss; |
|
ss << "GET " << u.path_ << " HTTP/1.1\r\nHost: " << u.host_ |
|
<< "\r\nAccept: */*\r\n" << "User-Agent: Wget/1.11.4\r\n" << "Connection: close\r\n\r\n"; |
|
s.write_some (boost::asio::buffer (ss.str ())); |
|
// read response |
|
std::stringstream rs; |
|
char response[1024]; size_t l = 0; |
|
do |
|
{ |
|
l = s.read_some (boost::asio::buffer (response, 1024), ecode); |
|
if (l) rs.write (response, l); |
|
} |
|
while (!ecode && l); |
|
// process response |
|
return i2p::util::http::GetHttpContent (rs); |
|
} |
|
else |
|
LogPrint (eLogError, "SSL handshake failed: ", ecode.message ()); |
|
} |
|
else |
|
LogPrint (eLogError, "Couldn't connect to ", u.host_, ": ", ecode.message ()); |
|
} |
|
else |
|
LogPrint (eLogError, "Couldn't resolve address ", u.host_, ": ", ecode.message ()); |
|
return ""; |
|
} |
|
} |
|
} |
|
|
|
|